[Interpreter] Add support for global declarations and load/store of global variables

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index aab15f9d3740b51ee94ea8585fa7ef2b564d0f95..5e75c360d81fe0f9290ee8edf53fe0c9511f8c98 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -90,11 +90,8 @@ class InterpreterAssembler {
   // Load a field from an object on the heap.
   Node* LoadObjectField(Node* object, int offset);
 
-  // Load |slot_index| from a context.
-  Node* LoadContextSlot(Node* context, int slot_index);
-
-  // Load |slot_index| from the current context.
-  Node* LoadContextSlot(int slot_index);
+  // Load |slot_index| from |context|.
+  Node* LoadContextSlot(Node* context, Node* slot_index);
 
   // Load the TypeFeedbackVector for the current function.
   Node* LoadTypeFeedbackVector();